It seems that Disney has recently made some kind of deal that made Petroglyph add some interesting updates to the Steam version of the game. Here's their developer note about this subject:

A note from the developer.

Hi Everyone,

We have continued to watch the EAW community closely over the years and appreciate all the excellent support you have given us and the game. Thanks to all of you for the great feedback, awesome mod packs, and overwhelmingly positive reviews.